Explosion characteristics of a biogas/air mixtures

Abstract

An experimental apparatus for the biogas and air mixture explosion in a closed spherical vessel was set up. Biogas-air mixtures were studied experimentally and numerically for different equivalence ratios between 0.25 and 2.4, and initial temperatures of 20, 50, 75, and 100 °C. For given equivalence ratios, more than 120 pressure-time curves were recorded. The effects of temperature on the maximum explosion pressure, maximum rate of pressure rise, and deflagration index were investigated. The most important results from evaluated experiments are the deflagration index 16 bar·m/s and the maximum pressure rise of 60 bar/s for biogas–air mixtures at initial ambient conditions.